package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Resource
    private DishMapper dishMapper;

    @Resource
    private DishFlavorMapper dishFlavorMapper;

    @Resource
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和    对应的口味
     * @param dishDTO
     */
    @Transactional//涉及多个表的数据查询
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品插入一条数据
        dishMapper.insert(dish);

        //获取inser语句生成的主键值（在mybait里面操作）
        Long dishId = dish.getId();

        //香口味表插入N条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否删除，状态是否在起售中
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //若菜品在起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断是否能够删除， 是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for(Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品对应的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }


    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据菜品id查询数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 更新菜品信息
     * @param dishVO
     */
    public void updateWithFlavor(DishVO dishVO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishVO, dish);

        dishMapper.update(dish);
        //删除口味信息
        dishFlavorMapper.deleteByDishId(dish.getId());
        //插入口味数据
        List<DishFlavor> flavors = dishVO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
        }
        //批量插入口味数据
        dishFlavorMapper.insertBatch(flavors);
    }
}
